add fixture for skip sprintf arg

Author: samsonasik

rules-tests/DowngradePhp80/Rector/FuncCall/DowngradeSubstrFalsyRector/Fixture/skip_sprintf.php.inc

@@ -0,0 +1,18 @@
+<?php
+namespace Rector\Tests\DowngradePhp80\Rector\FuncCall\DowngradeSubstrFalsyRector\Fixture;
+
+/**
+ * sprintf %s format converts false to empty string
+ */
+class SkipSprintf
+{
+    public function run(string $name)
+    {
+        return sprintf('Value: %s', substr($name, 2));
+    }
+
+    public function run2(string $name)
+    {
+        printf('Value: %s', substr($name, 2));
+    }
+}